Brake-shoe.



G. T. BOND.

BRAKE SHOE.

APPLICATION FILED JAN. 19. me.

I Patented Oct. 29, 1918.

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6. T. BOND.

BRAKE SHOE.

APPLICATIDN FILED JAN. 19. 1918.

1,282,737 Patented 00t.29, 1918.

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G T. BOND.

BRAKE s oe.

APPLICATION FILED JAN-19,1918.

1282,3787, Patented Oct. 29, 1918.

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GEORGE '1. BOND, 0F HUNTINGTON, WEST VIRGINIA.

BRAKE-SHOE.

weaver.

specification of Letters Patent.

Application filed January 19, 1918. Serial No. 212,626.

with a wheel-tread, and a holder, which 00- T operates witha brake-head to maintain the shoe in operating position.

The invention provides means, as hereinafter set forth, whereby the shoe-parts are held together in such manner that they may be disassembled without injury to the holder, threaded fasteners being used for this purpose.

The two members thus associated form a unitary shoe, which is attached to the brakehead in the usual manner of a single-member shoe in general use.

The invention has in view the provision of a brake-shoe that will be more economical in service than a reinforced or backed shoe of the usual form, which has to be removed and entirely scrapped when only alittle more than half worn, because of the liability of the wheel wearing through into the brake head and thereby damaging it. It is to overcome this objection that the holder of the shoe is made detachable, whereby it may be used successively on other friction or wearing members.

Even if a single-member shoe wears away in a uniform manner until the wheel almost comes into contact with the brake-head, there still is a considerable amount of material unworn, because of the attaching and retaining keepers extending into the brakehead.

With this invention, the keepers form an integral part of the holder, the concave surface of which is equi-distant from the wheeltread, so that, if the friction member wears away uniformly, there will be practically no unworn material remaining in the friction member. Thus, after wear and removal from a brake-head of a shoe formed in accordance with this invention, the holding member can be detached from the friction member, attached to a new friction member, and the shoe thus formed placed in service.

Another object of the invention is that, by interposition of the holder between the frlction member and brake-head, the head will be protected from wear by the holder even if the friction member is worn en- Patented @a. as, rare,

tirely away and friction is taken by the holder, for the latter is less expensive of replacement than the brake-head.

' The brake-shoe provided by the invention is simple to manufacture, its parts can be assembled quickly and easily and without the necessity of employing special tools, and the cast friction or Wearing member can be cleaned of adhering mold-sand and handled and transported without liability of damage of its parts. When read in connection with the description herein, the features of the invention will be apparent from the acco1npanying (l1'awings, forming part hereof, wherein embodiments of the invention are disclosed, for purposes of illustration. 7

While the disclosures herein now are considered to exemplify preferable embodiments of the invention, it is to be understood that it is not the intention to be limited necessarily thereto in interpretation of the claims, as alterations within the limitsof the claims canbe made without departing from the nature and spirit of the invention. Y

Like reference-characters refer to corresponding parts inthe views of the drawings, of which i Figure 1 is a side elevation, partly in section, of a 'brake-shoehaving a plurality of keepers, assembled and attached to a brakehead;

Fig. 2 is a plan view, showing in part the holding member and in part the wearing member;

Fig. 3 is a transverse section on the line MI -HI, Fig. 1.

Fig. 4 is a detail longitudinal sectional view on the line IV-IV, Fig. 2, illustrative of a method of locking an attaching-screw in place;

Fig. 5 is a fragmentary plan view, illustrative of the screw-locking arrangement;

Fig. 6 is a fragmentary longitudinal sectional view of the wearing member, illustrative of an alternative form of screwthreads therein:

Fig. 7 is a side elevation, partly in section,'showing an alternative arrangement with a standard brake-head;

Fig. 8 is a plan view of the form of shoe disclosed by Fig. 7, the holder being partly broken away to show part of the wearing member Fig. 9 is a transverse sectional view on the line IX-IX, Fig. 7';

Fig. 10 is a side elevation, partly in section, of another form adapted for use with a standard'brake-head, showing the holder held by bolts in association with the wearing member;

Fig. 11 is a plan view, showmg 1n part the holder and in part the friction member of the form disclosed by Fig. 10;

Fig. 12 is a fragmentary longltudinal sectional view on the line XII-XII, Fig. 11;

Fig. 13 is a view of a modificatlon of bolt arrangement; and

Fig. 14 is a sectional view on the line XIV-xiv, Fig. 13.

In all of the views in which those parts appear, 1 designates a brake-head, 2 deslgnates one or more recesses or seats or mortises formed therein for reception of a corresponding number of similarly shaped keepers 3 of a'malleable or otherwise suitably formed brake-shoe back or holder 4 secured to a wearing member 5, and 6 designates a retaining-key disposed-1n longitudinal openings 7 in the brake-head and 8 inn the keepers, the key and keepers maintaining the shoe on the head in a manner well known to the art.

In order that av worn wearing member may be removed from a holder and the latter again used in assoclation with a new wearing member, the invention contemplates the employment of threaded fasteners, for holding the parts together, which are disposed through the holder and have removable engagement in the wearing member.

The fasteners are disposed through and are rotatable in openings 9 in the holder,

these openings being slightly elongated or elliptical to allow for variation in the location of screw-threads in recesses or seats 10 in, the wearing member into which the fastenings extend. In all forms,'except that shown by Fig. 6, the recesses or seats 10 are slightly larger than the portions .of the fasteners disposed thereln, and the threads for engagement with the fasteners .are formed in material that is embedded in the wearing member at the time of casting thereof, the cutting of the threads preferably. being done prior to the casting operation.

In the forms illustrated by Figs. 1, 2, 3, 4,

greater area in plan than the recess or seat, and it is embedded in the wearing member at a place removed from the rear face thereof at the time-of casting and it spans the recess or seat. As the nuts are a distance from the open ends of the recesses or seats,

'the threads thereof are less liable to injury that of the seats or mortises 2 in the head,

the portions of the back that contact with the wearing member at the ends and between the keepers have the openings 9 countersunk, there being a pair of such openings in each abutting portion and each opening of a pair being located adjacent to aside edge of.

the back. The back or holder and wearing member are held t'ogetherby screws 12, the

heads 13 of which are seated in the countersunk openings 9 and the threaded shanks 14 of which engage in the embedded threaded members 11 In .order to relieve the fasteners of the shearing stresses imposed upon the wearing member by contact of the thread of a moving wheel, each abutting portion of the back or holder is formed between the screws with an opening 15, which takes a correspond protuberance 16 of the of the screws, both before and after the shoe is placed on the head, each of the countersunk openings 9 of the back or holder is formed with a slot 17, as seen clearly in Figs. 4.- and 5, and after the screws are set up a portion of .the head of each is spread or upset into the slot', as seen in Fig. 4, andthe fasteners thereby locked. The fasteners s0 locked may be turned out, when it is de-' sired to separate the holder and wearing member, by suitable tools able to overcome the locking act-ion.

If desired, the threads for. engagement of the threaded fasteners may be formed directly in the material of the wearing member, as shown at 18 in Fig. 6, instead of being formed in material different from the wearing member. abutting face of thewearing member is counter-sunk or formed with a depression at In this case, the back-- mea re?" the openings to the threaded recesses, as shown at 19, in order that the threads, as in the other forms, may commence at a place away from the face and thereby "be less liable to injury before insertion of the fasteners. r i

There is not .so much necessity of inter nally reinforcing a wearing member of the type exemplified by Fig. 1 as in the case of a form having a single keeper, because the plurality of keepers operate to retain all of the shoe on the brake-head after frac: ture between the holding-points, as sometimes occurs. With a single-keeper-shoe, in order to deter fracture, to aid the back in holding the parts together in case of freeture, and at the same time to provide material dili'erent from the wearing member to carry threads for engagement with the fasteners, strips are disposed longitudinally of and are embedded in that member at the time of casting. Although shown only in a shoe of the single-keeper type for a standard head, the strips, of course, may be used in a multiple-keeper'shoe such as shown by Fig. 1.

Usually two such strips are provided in a wearing member, and each is positioned comparatively near a side edge of the memher outside of the protuberances 21 located at the end portions of the member to seat in depressions in the brake-head to relieve the keeper of some strain; as shown by Figs. 7, e

8, 9, 10, 11, and 12.

The recesses or seats 10 of the form shown by Figs. 7, and 9 are arranged in alinement with t e strips and are spanned thereby, and a pair thereof is positioned at places corresponding to the points of contact with the holder d. in this form, the screws '12 extend through the holder into engagement with threads in the strips, there is little liability of their working out because vof contact of the brake-head against the heads of the screws, as a further precaution against loosening of the screws they with a shoe for service on a standard bra-kehead, which takes a single keeperand which is recessed on each side of the kecpenrecess (as shown at 1 in Fig. 10), as the recesses accommodate the heads of the fasteners.

Having reference to Figs. 10 and ll, bolts 22 extend'through the holding member (at places where the latter is not contacted by the head) into the recesses 10 of the wear ing member, wherein they engage threads in the strips 20. Usually there are two such fasteners at each side of the keeper, and those of each pan" are disposed in lines oblique to the axis of the wearing member shoe, as exemplified by Figs. 13 and ll.

which show one of the contact-poi1its of the head and shoe-back or holder. in such a case, the brake-head is formed in each contact portion with transverse slot El, bolts .22 are used in place of the screws shown by Fig. l, the heads thereof pass into the slots during the lateral movement of placing the shoe on the head, and the walls of the slots by contact with the sides of the bolt-heads prevent the fasteners. from working loose. Preferably the bolts have oblong heads to make the locking action more reliable.

ln order that the body of the wearing member ma be worn away almost entirely prior to reaching points of contact with the back orholder, and thus to decrease the liability of injury to that member and the head, protuberances or raised portions on the wearing member contact with the holder and maintain it slightly removed from the body, these by 25 in l l, 5, (S, 7; 8, 10, l1, and 13, and they also being in the form of bosses surrounding the openings of the recesses 10 for the bolts 22 as seen in 'l i ill and ll.

it will be seen that in all of the forms of wearing member herein disclosed the threads for engagement with the back or to prevent the loosening of the fasteners while in service. Further, the wearing member has no fixed projecting parts permanently projecting that are liable to damage during the period between fabrication and attachment to a holder,

protuherances being designated- Having thus described my invention, what I claim as new, and desire to secure by LettersPatent, iS- -1. In a brake-shoe, a holder having a keeper arranged to cooperate with a brakehead and formed with fastener-openings, a wearing member abutting said holder formed with threaded ways, and threaded fasteners rotatable in said holder-openings and engaging in said threaded ways whereby said parts are detachably held together.

2. In a brake-shoe, a holder having a keeper arranged to cooperate with a brake' head and formed with fastener-openings, a wearing member abutting said holder having ways formed with threads commencing at points removed from the openings thereof, and threaded fasteners rotatable in said holder-openings and engaging in said threaded ways whereby said parts are detachably held together.

3. In a broke-shoe, a holder having a keeper arranged to coope ate with a brakehead and formed with fastener-openings, a wearing. member abutting said holder formed with threaded ways, threaded fasteners rotatable in said holder-openings and engaging said threaded ways whereby said parts are detachably held together, and means whereby said fasteners are locked against rotation.

l. In a'brake-shoe, a holder having a keeper arranged to cooperate with a brakehead and brake-head contact-points at other places formed with fastener-openings, a wearing member abutting. said holder formedwith threaded ways, and threaded fasteners rotatable in said holder-openings andengaging said threaded ways whereby said parts are detachably held together.

5. In a brake-shoe, a holder having a keeper arranged to cooperate with a brakehead and formed with fastener-openings, a wearing member abutting said holder formed with ways, members embedded in said wearing member and spanning said ways below the holder-contacting points and having threaded openings in said ways, and threaded fasteners rotatable in said holderopenings and engaging in said threaded openings whereby said parts are detachably held together.

6. In a brake-shoe, a holder havinga keeper arranged to cooperate with a brakehead and formed with fasteneropenings, a wearing member abutting said. holder formed with a series of ways, a reinforcingstrip embedded in said wearing member and spanning said ways belowthe lIOlLlQf-COH- tacting points and having threaded openings in said ways, and threaded fasteners rotatable in said holder-openings and engaging in said threaded openings whereby said parts are detachably held together.

7. A wearing member for brake-shoes having ways opening to its rear face formed with threads commencing at points removed from the open ends thereof arranged to receive fasteners for its attachment to a holder.

8. A wearing member for brake'shoes having ways, and members embedded therein spanning said ways below the rear face thereof and having threaded openings in said ways arranged to receive fasteners for attachment of the wearing member to a holder.

9. A wearing member for brake-shoes ha'n ing a series of ways, a reinforcing member embedded therein spanning said ways and having threaded openings in said ways ar ranged to receive fasteners for attachment of the wearing member to a holder.

10. In a brake-shoe, a wearing member having protuberances on its rear face and threaded ways in said protuberances, a holder having a keeper arranged to coiiperate with a brake-head and formed with fastener-openings, and threaded fasteners rotatabl in said holder-openings and engaging in said threaded ways and maintaining said holder to said wearing member in'abutment. with said protuberances.

11. In abrake-shoe, a wearing member having protuberances on its rear face, and a holder having a keeper arranged to cooperate with a brake-head and. dctachably secured to said wearing member with a face in abutment with said protuberanc'esand thereby maintained slightly removed from the body proper of the wearing member.

In witness whereof I have aflixed my signature.

GEORGE T. BOND. 

